100Mbps is about 12MB/s (Average speed for a HDD is 40MB/s to 90MB/s) More platters you have in a drive the faster the drive is.
1000Mbps is about 125MB/s (Only HDDs that can run at that speed and faster are SSD but the 1.5TB 5 platter drive do run at 100MB/s so it's still better to get a modem that has 1000Mbps WAN)

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